Prasophyllum perangustum D.L.Jones

Plants 150–40
 tall. Free part of leaf to 120 x 5–6mm. Spike 60–10
 long, 7–15-flowered. Ovary sessile, green. Flowers uncrowded, lightly scented, 12–14 x 6–8mm, greenish or light reddish, labellum white, callus green. Dorsal sepal 5.5–7 x 3mm, decurved. Lateral sepals free, 7–8 x 2mm, erect, slightly divergent. Petals 5–6 x 1.
 porrect, with brown line. Labellum sessile, ovate-lanceolate, 6–7 x 2.6–3.2mm, sharply recurved near middle, covered with small elongate papillae, apex drawn-out and tail-like. Callus narrow, tapered, papillate, channelled, narrowed distally and extending nearly to labellum apex.

Known with certainty only from the type locality where it grows on steep slopes and ridges in sparse grassy forest dominated by white peppermint (Eucalyptus pulchella) in freely draining clay soil.